So, it looks like it will do a lot of what you want to do, but unfortunately not all of it. I suspect the reason for that was that Plex re-transcodes everything on the fly, but the DS Video app/Video Station on the NAS knew it didn't need to transcode the the M4V file before streaming it. I then tried some my larger M4V iTunes files that had failed with Plex and they streamed perfectly. A file with a lower bitrate and using the AC3 audio track might have worked just fine though. When I selected the AC3 audio track it played, but the whole screen would flash green every couple of seconds making it unwatchable. The file wouldn't play at all if I selected the DTS audio track. Then I tried a straight Blu-ray rip MKV (24 GB file for a 2 hour movie) that did have DTS audio. I then tried a lower quality MKV (about 900 MB file for a 2 hour movie) and that worked fine as well. Granted the quality of the AVI files that I was able to dig up wasn't that great, but they did work with Airplay from the DS Video app. So I ran some tests tonight and here's what I found:ĪVIs work fine. Oh, and I also have some MKV/h.264/DTS files as rip backups so I can test that out as well. I can run a few tests on my system when I get home tonight if you'd like. Again, I'd have to run some tests (all my files are in the Apple TV friendly m4v format so I've never had to figure this out). It might be that the DS Video app on the phone would transcode the. I think what you're looking to do could possibly be done with the Video Station on the Synology and the DS Video app on the iPhone, but I would have to test it out to be sure. It probably doesn't help that my Synology is a slightly older model, but I believe its processor is still more powerful than the one in the DS214+/Play. I don't know if it was because the bitrate was too high or maybe because Plex is a 3rd party app and not the 'built in' Synology Video Station app, but I had to install the Plex server on my 2012 Mac Mini to get it to work properly. I tried to get Plex to run locally on my NAS and although it worked fine for standard definition videos it had trouble transcoding and streaming my high quality 1080p files. If you go for the DS214+/Play for the local transcoding aspect be warned that it might have trouble with high bitrate 1080p videos. I don't have any experience with the Infuse Pro app, but I do have a Synology NAS (DS2413+).

Synology plex media server dts video